Overview
2-Bromopyridine is a halogenated heterocyclic compound primarily used as a versatile intermediate in organic synthesis. It belongs to the pyridine family, where a bromine atom is substituted at the 2-position. This compound is particularly valued in pharmaceutical and agrochemical industries for its role in cross-coupling reactions, such as Suzuki and Negishi couplings, which are critical for constructing complex molecules. Its production involves bromination of pyridine or its derivatives under controlled conditions. Due to its reactivity and toxicity, 2-bromopyridine requires careful handling and storage to prevent accidents or environmental contamination. Industrial use is governed by strict regulations to ensure worker safety and environmental protection.
Physical and Chemical Properties
2-Bromopyridine is a colorless to pale yellow liquid with a distinctive, pungent odor. It has a density of 1.657 g/cm³ at 25°C and boils at 193-194°C, with a melting point of -42°C. The compound is soluble in common organic solvents like ethanol and ether but only slightly soluble in water, making it suitable for reactions in non-aqueous media. Chemically, it exhibits typical reactivity of aryl bromides, participating readily in nucleophilic substitution and metal-catalyzed coupling reactions. The bromine atom’s electronegativity and the pyridine ring’s nitrogen influence its reactivity, enabling selective transformations. Stability under normal conditions is good, but it decomposes upon exposure to strong acids or bases, releasing toxic fumes.
Main Applications
2-Bromopyridine is a key building block in pharmaceutical synthesis, where it serves as a precursor for active pharmaceutical ingredients (APIs) and drug candidates. Its utility in Suzuki-Miyaura and other palladium-catalyzed couplings makes it indispensable for creating biaryl structures found in many drugs. In agrochemicals, it is used to synthesize herbicides, fungicides, and insecticides, leveraging its ability to introduce pyridine moieties into target molecules. Additionally, it finds niche applications in material science, such as ligand preparation for metal complexes and polymer modification. The demand in research and industrial settings continues to grow due to its versatility.
Safety and Storage
2-Bromopyridine poses significant health risks, including toxicity upon ingestion, inhalation, or skin contact. It causes severe irritation to the eyes and respiratory tract, necessitating the use of personal protective equipment (PPE) like gloves, goggles, and respirators during handling. Storage requires airtight containers in cool, dry, and well-ventilated areas, away from oxidizing agents and strong acids. Spills must be contained with inert absorbents and disposed of as hazardous waste. Regulatory compliance with OSHA, REACH, and other frameworks is mandatory for industrial users to mitigate risks to personnel and the environment.
B2B Procurement Guide
When procuring 2-bromopyridine, prioritize suppliers with ISO or GMP certifications to ensure quality and consistency. Request certificates of analysis (CoA) to verify purity, typically ≥98% for most applications. Bulk purchases (kilograms to tons) often qualify for discounts, but confirm lead times and shipping conditions, as hazardous material regulations apply. Evaluate packaging options—sealed drums or amber glass bottles—to prevent degradation during transit. For international shipments, ensure compliance with local regulations (e.g., TSCA in the U.S., REACH in the EU). Establish long-term contracts with reliable suppliers to stabilize pricing and supply chains, especially given fluctuating raw material costs.
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